Background Acute myocardial infarction can be triggered by acute respiratory infections.
Previous studies have suggested an association between influenza and acute myocardial …

SARS-CoV-2 variants of concern (VOC) are more transmissible and may have the potential
for increased disease severity and decreased vaccine effectiveness. We estimated the …

Importance The incidence of SARS-CoV-2 infection, including among individuals who have
received 2 doses of COVID-19 vaccine, increased substantially following the emergence of …

Objective To estimate the effectiveness of mRNA covid-19 vaccines against symptomatic
infection and severe outcomes (hospital admission or death). Design Test negative design …

Importance Nursing home residents have been disproportionately affected by coronavirus
disease 2019 (COVID-19). Prevention recommendations emphasize frequent testing of health …

Importance As a result of low numbers of pediatric cases early in the COVID-19 pandemic,
pediatric household transmission of SARS-CoV-2 remains an understudied topic. Objective …

Background There is growing evidence supporting the efficacy of shorter courses of antibiotic
therapy for common infections. However, the risks of prolonged antibiotic duration are …

In response to the CMAJ news article,“Communication, transparency key as Canada faces
new coronavirus threat,” 1 we would like to share the public health response to the first …

Background: A resurgence of pertussis cases among both vaccinated and unvaccinated
people raises questions about vaccine effectiveness over time. Our objective was to study the …

We estimated the effectiveness of booster doses of monovalent mRNA COVID-19 vaccines
against Omicron-associated severe outcomes among adults in Ontario, Canada. We used a …